Identification of Caterpillar D2

Anonymous-0

Well-known Member
I hope someone can help me. My son just bought a non-running D2 and we are trying to verify which diesel engine it has before working on it. The main tag on the frame is rubbed away, so I cannot get a serial number from it. I did find a stamped number on the upper engine block, left side, just below the head. Only the two rivets remain there, but the number stamped there is 9T894. Is this the serial number of the engine and machine? This machine has no pony motor, it is direct electric start. I think it is a 1956 or 57, but maybe some of you would know. Thanks for taking time to read and hopefully you can help.
Alton
 
That is not a valid number for a D2---there should be stamped into the casing/block in the area behind where the tag is missing the serial #
The rear serial #/tag should be on the housing to the upper left of the drawbar and the same # should be on the block just above the pinion/clutch levers on the left side.
all serial numbers should start with 3J,5J,4U.5U as these were the only models made. 1957 is the last year the D2 was made.
 
(quoted from post at 17:56:35 04/23/14) I hope someone can help me. My son just bought a non-running D2 and we are trying to verify which diesel engine it has before working on it. The main tag on the frame is rubbed away, so I cannot get a serial number from it. I did find a stamped number on the upper engine block, left side, just below the head. Only the two rivets remain there, but the number stamped there is 9T894. Is this the serial number of the engine and machine? This machine has no pony motor, it is direct electric start. I think it is a 1956 or 57, but maybe some of you would know. Thanks for taking time to read and hopefully you can help.
Alton

Your engine has been replaced by a previous owner from a Cat 212 grader with serial number 9T. It used the same D311 engine as the D2 4U and 5U serial number units did. I think the horsepower was higher in a grader than a dozer.

The D2 4U was the narrow gauge and the D2 5U was the wide gauge tractor.

dpendzic can probably tell which tractor that you have if you can post a picture of it, as I haven't been around them much. My experience is more with the 212 grader.
 
Thanks for the information. We are going to look more closely for the number at the upper left of the drawbar. So far, I do not even see any rivet holes. But the machine has been repainted a time or two and the holes may be painted over.
 
Finally, things are making sense. I can't thank you enough. I will post some pictures today of the dozer in hopes of determining the model. Now, we can buy a book on the engine. The engine is seized. We were unable to budge it using a pry bar on the flywheel. The exhaust was left uncovered and the intake was left unflanged at the top. I think we will have to remove the engine head to free it.Does anyone know where to find gaskets for the engine?
 
Here is an image of the D2
a155055.jpg
 
Looks like a U model to me
4U is 40 inches center to center of tracks
5U is 50 inches center to center of tracks
Later U models had solid 3/8 steel fenders where earlier ones had thinner metal and a rolled edge for stiffness
You have the solid front idlers and appear to be the larger ones at 23 1/2 inch diameter
 
It has the optional bucket seat too.

Nice looking tractor. Hard to tell but I think it's a 4U narrow gauge.
 
The tracks do measure 50 inches center to center and the front wheels measure about 23.5 inches. So, you think it is a 5U tractor? Were they made in the last couple of years?
Thanks for taking time for this,
Alton
 
Yep--a 5U---last D2 made in 1957.
sometime in 1953 the U models were lengthened slightly so that the main clutch assembly could be pulled without pulling the engine
 

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